[Collins] 4D32 question

[jeremy-ca]

Johnson included instructions on converting to the 829B. I'd guess that it 
was applicable to the 32V series also.

The 829B, 3E29, 5894 and 7854 are still fairly common so if 4D32's run out 
again we always have a backup plan.

Carl
KM1H


----- Original Message ----- 
From: "Dr. Gerald N. Johnson" <geraldj at storm.weather.net>
To: <collins at mailman.qth.net>
Sent: Sunday, August 05, 2007 10:41 PM
Subject: Re: [Collins] 4D32 question


> On Sun, 2007-08-05 at 19:46 -0400, jeremy-ca wrote:
>> Thanks Gerry, thats about what I figured but didn't know if there was a
>> particular issue with the seals. Haven't had a rig with one since 1960 
>> which
>> was a Viking I; just got another last week.
>> That tube is all over the place lately, even way over priced places like
>> Surplus Sales and Gold Co have it down to $20.
>>
>> Carl
>> KM1H
>>
> The 4D32 was only used a couple places that I know of, the Viking I and
> Collins 32V. It was an odd tube almost custom made to evade vacuum tube
> excise taxes and has lots of glass to metal seals that are large
> diameter and so there's more seal surface to leak. I'd want to purchase
> only after inspection or awfully cheap so I could give them the cooking
> and gas check before applying plate voltage.
>
> I'm remembering the 5CX1500 with its extra seals and how it fails by
> going gassy, but its big enough broadcasters can have it rebuilt.
>
> Must have been a cache dug up for the prices to be falling or those who
> have tried to put the Viking I on the air are quickly discovering why
> there was a Viking II with TVI shielding the Viking I lacked. And that's
> likely a problem with the 32V also since it came out before TV.
> -- 
> 73, Jerry, K0CQ, Technical Advisor to the CRA
> All content copyright Dr. Gerald N. Johnson, electrical engineer
>
> ______________________________________________________________
> Collins mailing list
> Home: http://mailman.qth.net/mailman/listinfo/collins
> Help: http://mailman.qth.net/mmfaq.html
> Post: mailto:Collins at mailman.qth.net
>
>